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Broken sx px73

We own a sx px 73 digital piano. The C, E, G# keys (all of them) can only be played once after we turn on the piano. When they are pressed, they produce a loud sound and they they won’t sound again. Does anyone know whats wrong and how we can fix it?

We own a sx px 73 digital piano. The C, E, G# keys (all of them) can only be played once after we turn on the piano. When they are pressed, they produce a loud sound and they they won’t sound again. Does anyone know whats wrong and how we can fix it?